package com.may._5;

import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

public class SemaphoreDemo {
    public static void main(String[] args) {
        Semaphore semaphore = new Semaphore(3);//限制3个车位
        for(int i = 0; i < 6; i++){//模拟6部车
            new Thread(() -> {
                try {
                    semaphore.acquire();
                    System.out.println(Thread.currentThread().getName()+"\t 抢到车位");
                    try { TimeUnit.SECONDS.sleep(3);} catch (InterruptedException e) {e.printStackTrace();}
                    System.out.println(Thread.currentThread().getName()+"\t 停车3秒后离开车位");
                } catch (Exception e) {
                    e.printStackTrace();
                }finally {
                    semaphore.release();
                }
            },String.valueOf(i)).start();
        }
    }
}
